J. Kissel, K. Izumi

We have successfully mapped the IR beam into HAM4. In order to do so, we've increased the laser power to 1 [W] (see below for process / details). We've now handed off further alignment of ITMX, BS, and SRs to Betsy & Travis.

- Power meter reading after temporary half-wave plate just before PSL periscope before power increase before change: 202 [mW].
- PSL Monitor PD (IO_AB_PD2) reading ~20 [ct].
- Re-confirmed bypass path is aligned looking at IM4 trans wall-spot position, and IM4 trans QPD. Good; check.
- Confirmed MC3 is blocked with metal protection plate -- only IMC bypass beam continues through to IFO. No light resonant in IMC.
- Moved PRM to parking position P = -107; Y = -5707 (see LHO aLOG 9377)
- Unlocked/untagged power control of rotation stage, energized rotation stage.
- Tried using temporary half-wave plate just before final PSL periscope to increase power via polarization, but transmission was already at maximum (as measured by IR card at PR2 in HAM3).
- Changed rotation stage angle to 72.25 [deg] via MEDM
- Power meter reading after half-wave plate after power increase after change: 1.08 [W]
- Monitor periscope PD is at ~125 [ct]
- For the record -- beam looks dreadfully mis-centered (withing 1 [beam diameter]) of light pipe edge in yaw (though this has not been changed, and alignment into IMC was confirmed good yesterday).
- De-energized rotation stage, locked/tagged power control of rotation stage.

Kyle, Gerardo 

Found pirani gauges working today -> Spun turbo pump up and demonstrated Safety Valve interlock closure as a function of foreline pirani gauge -> OK

This morning I took dtt tf measurement in one DOF (pitch) of the triple suspensions of the input and output arm to check if there is any obvious rubbing issues that could be problematic for the alignment that we are trying to achieve. MC1 MC2 MC3 PRM PR2 PR3 SRM SR2 SR3 were checked and look fine (cf attachment, with the new measurement compared to a past reference)

Jeff K, Jess M

Today (Friday, July 11) at 15:41 UTC Jeff K set ETMY ISI stages 1 and 2 to level 1 isolation.  We paused the ETMY Guardian and used command scripts to get there. 

The T240s were still setlling down as of ~15:45 UTC but the transition was successful. 

The blend filters are still the same as two days prior (TBetter on all except TCrappy on RZ). 

Please leave SEI ETMY in level 1 isolation. We will leave the chamber in this state overnight.

On Wed, Travis and I were able to coarsely align the ITMy main chain pitch.  This involved the loathed addable mass swapping at the UIM in order to correct a differential pitch between Top Mass and UIM.  We are at the point that we need a first look from IAS to determine how to progress.  

With Fil's help, we also checked out the ESD connections.  This turned into a mess whereby we chased non-functioning throughput up through the connections within the SUS and ISI back to the feedthru.  The connection at the inside of the feedthru seemed fussy and needed reseating multiple times in order to get all 5 pins to connect properly with signal to the outside world.  From there, continuity was checked at the CP connection which failed on 2 pins.  So, more investigating of the cable running from the ISI table to the CP needs to be done (and possibly a full cable swap).

Attendees: Fred, Christina, Jeff K, Daniel, Jeff B, Corey, Hugh, Jason, Richard, Arnaud, Aaron, Dugh, Jim, Travis, Filiberto, Santiago, etc

Today's Tasks:

* HAM5 SR3:  After fixing the broken magnets, Transfer Functions results showed rubbing on SR3.  Jeff B will re-check SR3 for any possible rubbing. – Jeff B

* H1 IMC Bypass Alignment: It will continue today. The alignment on PR2 needs to be adjusted for the beam to be centered on PR3)- Jeff K/Kiwamu

* ITMy work might continue today (more cable investigation) – Travis

* TCS Work: BSC3 alignment (A beam will be projected from BSC3 to BSC2) – Thomas

* Building up chassis will continue – Richard.

* ITMY alignment setup (continuation) - Jason

only unexpected restarts of h1fw0 as h1ldasgw0 went unstable again, starting at 16:58PDT.

J. Kissel, A Pele

Not much to say, we've jus gotta start the iteration process. SR3 is rubbing!

J. Kissel, A. Pele, K. Izumi, T. Sadecki

After Bartlett had completed repairs on SR3, we wanted to get PSL IR light into the output arm in order to confirm that alignment had been restored after finding it pitched down after HWS work last week (see LHO aLOGs 12599 and 12609). However, we immediately found no light coming from the input chain. After confirming that all suspensions were in the same location as the last time this temporary bypass path was aligned (circa June 26th 2014), upon going into HAM2 to investigate we found the by-passed IMC beam clipping after IM1, and not making it through the Input Faraday Isolator. 

Suspecting that the temporary by-pass optics had been bumped (they're right on the edge of the table -- see attached layout), we elected to restore the main IMC trans path alignment to check if the bypass path was still co-linear. The trans path alignment had not yet been restored into flashing again after the 2 [mm] move. Thankfully, with the help of the irises on the table, restoring the IMC flashing required no more than a ~900 [urad] adjustment in Yaw. No change in PSL PZT or MC1 was required; unblocking MC1 revealed that we hit the first (in HAM2 just beyond MC1) and 2nd (in HAM3 just in front of MC2) irises, and were only off by an iris radius in yaw. Nice work pusher team!

Once IMC trans path was restored and flashes found, we confirmed that this path was still centered on IMs 1-4, to ensure a good reference path alignment against which to compare the by-pass. Indeed, with the trans path aligned, we found the bypass path was no longer co-linear.

We spent the rest of the evening re-aligning the by-pass path, and the main beam now is re-aligned up to PR3 (beam hits PR3, but PR2 alignment still needs tweaking to be centered on PR3). 

We've confirmed our alignment with the following:
- By-pass beam is co-linear with IMC trans beam up to IM2
- By-pass beam hits reference spot on the wall
- By-pass beam shows up on IM4 trans QPD
- By-pass beam is centered (by eye) on PR2

In order to help see the spot on PR3, we've turned OFF PR3 optical lever (though left the HAM2 ISI oplev ON). We've elected to leave it OFF, such that we can resume where we left off tomorrow morning. MC1 remains *unblocked,* but MC3 has its metal protective shield on to block the main IMC trans path.

Details for the record:
IM4 Trans QPD SUM values:
    ~4 [ct] BLOCKED
   ~50 [ct] UNBLOCKED

Suspended optics alignment values (in [urad]):
     MC1     MC2     MC3    IM1    IM2     IM3     IM4     PRM     PR2    PR3
P   +1254   +542    -550     0    +35849  +14057  -30000 -540.1  -2000  -245.5
Y   -2366   -550   -2557  3786    +5154.7  +5464  -8737  -244.1  +1000  -250.9
    

In order to double check for rubbing after the magnet repair on SR3, undamped/damped tfs were started on the top mass, and will run overnight on opsws1.

J. Kissel, J. McIver

H1 SEI ETMY has been operating in Fully_Isolated since
2014-Jul-07 19:56 UTC,
after a Stage 2 GS13s trip. We requested ETMY to go to DAMPED (and it completed doing so) at 
2014-Jul-10 17:58 UTC

We will leave the chamber as such overnight, in attempt to get a 24 cycle of performance in this state for long-term performance studies.

Please leave SEI ETMY in DAMPED, unless you talk to Jess or Jeff.

Kyle, Gerardo

Preparation for Monday's vent -> Spun turbo up but shut it down shortly thereafter -> pirani card in gauge controller isn't working for some reason so now turbo safety valve won't close when foreline threshold is exceeded -> will swap cards tomorrow and get turbo going then

Locked the ISI so we (w/ Thomas) could do the HAM4 ISI Optical Table Optical Lever alignment.  I left the ISI locked.

I had the EPICS gateway processes for the vacuum subnet* re-read their access security files to add a missing channel prefix to the whitelist.  This is a zero downtime action.

*h0ve-ws, h0ve-cds, h0ve-h1fe

While assessing the IMC alignment for SR work, we (Kissel, Kiwamu, me) noticed a significant amount of scattered light from the transmitted part of the PR3 OpLev beam.  See photos.  It looks to be a bit low of center on PR3 and is scattering off a nice shiny round aluminum piece in the MC REFL periscope directly behind PR3.  Looking for advice on what to do about it.

Andres R. & Jeff B. 

   The regluing of the LL magnet/standoff was successfully completed. The repair jig has been removed from HAM5 and the AOSEMs have been remounted. They have been gross aligned. The suspension EQ stops have been released. 

NOTE: Found several Top Mass EQ stops touching the mass, (these stops were not put on for the magnet repair). When I released these stops there was a visible jump movement of the top mass. We will see if this is a contributor to the SR3 pitch misalignment. 

Particle Counts
Before Work:
 In cleanroom cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0
 In chamber cover on: 0.3 = 17, 0.5 = 10, 1.0 = 2

During work:
 In chamber cover off: 0.3 = 46, 0.5 = 27, 0 

After work: 
  In cleanroom cover on: 0.3 = 0, 0.5 = 0, 1.0 = 0
  In chamber cover on: did not get   


 

We've eliminated all ground loops that  can be easily eliminated in chamber at this point. There are two remaining grounding-related issues.

1. There seems to be a serious ground loop problem for OMC DCPD and OMC QPDs, which is described in a separate alog (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12349).
2. Shield for beam diverter cables (there are two) appear to be grounded to the ISI via mighty mouse connector. This is Beckhof and there's no signal that needs a great S/N or anything on these cables, and I don't know how the grounding of Beckhof chassis is done, but we might want to modify the in-air DB25 cable to cut the pin13 wire at the feed through.

The first problem will NOT be addressed until I hear back from Rich.

The second issue is dealt with in air (if the solution is to cut pin13 wire).

We "fixed" another tiptilt with more annoying problem than yesterday (see below).

We "fixed" a bunch of other things by changing four in-vac cables (also see below).

Apart from the issues noted above, we checked picos, OMC REFL QPD (sled), AS_C QPD, WFS(DC) and OMC SUS, and these are all good.

Everything is connected back except the DCPD and OMC QPD cables at the field rack.

We didn't like the way a big coil of cables was dangling from ISI table top to the side, no idea why this was done (just an extra weight without real merit), so we moved it to downstairs. Due to the reduced weight on the ISI, Hugh might want to rebalance ISI.

Tomorrow I'll be out, but Corey and Dan will have to do the following:

1. Re-center BOSEMs of TT2 and TT3. These are the units that we pulled and reinstalled. Most of the coils are OK, but one of the upper coils for each TT is not well centered.
2. Check if QPDs, WFS(DC) and DCPDs work using a flash light, because we messed with the cables. There are 5 QPDs, 2 WFSs  and 2 DCPDs. Right now all corner station ISC whitening are crazy, ask Daniel to fix before you go in chamber. You also need to connect the DCPD cable and OMC QPD cable back to the field rack.
3. Check if beam diverters and picos work, because we messed with the cables.
4. Unlock ISI and give it to Hugh.

After this I don't have a problem closing HAM6 for now.